Displacement Stretched
To have consistent scale, create an Empty in your scene and make it control the texture scale.


Create an Empty
Edit your material by adding an Input>Texture Coordinate, using the Object socket and linking it to the Empty in the "Object" dropdown


Scale (, Rotate, Move) the Empty to make the feature the size you want. This will apply in a coherent way to both objects that share that material.




Big Empty



Small Empty

Note: if your object is going to be moved in animation, and you want the texture to stick to it, then you should either (1) parent the empty to it, (2) consider following Mark Jackson's answer (although you will need to adjust the proportions of the texture manually), or (3) use an UV map.